package cn.jhz.learn.blog.common.util;

import org.apache.commons.lang3.StringUtils;

public class LevelUtil {
	
	public final static String SEPARATOR = ".";
	
	public final static String ROOT = "0";
	
	// 0
	// 0.1
	// 0.1.2
	// 0.1.3
	// 0.4
	public static String calculateLevel(String parentLevel, int parentId) {
		if(StringUtils.isBlank(parentLevel)) return ROOT;
		else return StringUtils.join(parentLevel, SEPARATOR, parentId);
	}
}
